초록 ▼

The plastic extruder assembly is of the type that includes an extruder barrel assembly and an extruder die chamber in the distal end of the extruder barrel assembly. The die chamber has means for receiving and mounting a die assembly therein and the die assembly has die holes extending therethrough

The plastic extruder assembly is of the type that includes an extruder barrel assembly and an extruder die chamber in the distal end of the extruder barrel assembly. The die chamber has means for receiving and mounting a die assembly therein and the die assembly has die holes extending therethrough to an outer face. A layer of insulating material is provided beneath the outer die face at least in the area of the die holes for inhibiting if not altogether preventing freezing of the plastic in the die holes. Also, radial and circumferential hot oil passageways are provided in the die assembly and the die holes are offset in either a concentric array or a series of spirals.

대표청구항 ▼

In a plastic extruder assembly of the type having an extruder barrel assembly and an extruder die chamber in the distal end of said extruder barrel assembly, said die chamber having means for receiving and mounting a die assembly therein, a die assembly in said die chamber, said die assembly having

In a plastic extruder assembly of the type having an extruder barrel assembly and an extruder die chamber in the distal end of said extruder barrel assembly, said die chamber having means for receiving and mounting a die assembly therein, a die assembly in said die chamber, said die assembly having extrusion orifices extending therethrough and an outer face, the improvement comprising: insulating means beneath said outer die face at least in the area of said die orifices for inhibiting if not altogether preventing freezing of the plastic in said die orifices; said die assembly comprising an annular die ring having die orifices extending therethrough; a die plate defining said face and having die inserts defining said orifices, extending therethrough; a die mounting ring extending peripherally about said die ring; said die ring including means for conveying hot fluid to and around said annular die ring and adjacent but spaced from said inserts to maintain the ambient temperature surrounding said die inserts at an elevated level thereby to keep the plastic passing therethrough molten, whereby said insulating means aid in maintaining said elevated temperature of said annular die ring which surrounds said die inserts, said conveying means comprising an outer annular passageway in said die ring, an inner annular passageway in said die ring, and radial passageways in said die ring situated between adjacent die inserts in said die ring and extending between said inner and outer annular passageways; said insulating means comprising an annular ring of insulating material which is disposed between said die plate and said die ring and which is of pressed asbestos and extensions of said die inserts extending through said annular ring of insulating material to said die insert extensions in said die plate.